In "Double Dipper", the two go to the party that Stan Pines hosts at the Mystery Shack together, also bringing what seems to be Grenda's pet iguana or an iguana that she is taking care of. It is there that they meet Mabel. Grenda is the first to talk to her, and introduces her to Candy as well. She and Candy cheer for Mabel while she tries to win the party crown in a competition against Pacifica Northwest. Grenda tells Mabel that she wants to put Pacifica in a headlock and "make her feel pain" after Pacifica insults Grenda's voice by saying that she sounds like a wrestler. After Pacifica wins the crown and leaves with most of the party goers, Grenda and Candy announce their intent to have a sleepover with Mabel, and how happy they are that they are friends. Then the three girls start dancing, exclaiming "dance dance dance."
Grenda appears again in "Summerween," dressed as a witch, and goes trick-or-treating with Candy, Soos, Dipper, and Mabel. Stan asks her if she has a cold due to her voice, and she gets upset. She is one of the witnesses of the Summerween Trickster's appearance, and helps Dipper and Mabel collect five hundred pieces of candy to satiate the creature. Later, when they're fighting with the monster, she tastes him and exclaims, "Saltwater taffy? Gross!"
In "Carpet Diem," Grenda and Candy go to Mabel's house to have a sleepover where they are shown playing "Calling All Boys: Preteen Edition," and talking to a robotic-voiced boy named Kevin. Later, they find Dipper in Mabel's body and take him upstairs for a second sleepover. After Dipper and Mabel switch back, Mabel tells the girls about the electric carpet's magical properties. Grenda switches bodies with several other people, including Old Man McGucket, Waddles, and Mabel. In the end, everyone ends up back in their own bodies.
In "Boyz Crazy," Grenda, Mabel, and Candy attempt to attend a Sev'ral Timez concert (the concert was sold out). Afterwards, they sneak backstage, discovering that the band members are actually clones being held as slaves by their producer. They release the boys and bring them to the Mystery Shack. Soon after, Mabel becomes highly possessive of them, forcing Grenda and Candy away. Eventually, Mabel decides to let the band go, and the three release them into the wild.
In "Gideon Rises," she and Candy reappear as Dipper and Mabel prepare to leave Gravity Falls. The two girls are seen comforting each other. They do not appear after that, and it is unknown if she and Candy know that Dipper and Mabel came back.
In the short "Mabel's Guide to Fashion", she commentates on Mabel's fashion show, and helps her in Soos' "flash makeover". She also comments favourably on Mabel drawing a face on Old Man McGucket's bald spot.
In the short "Mabel's Guide to Colors", Mabel asks her what her favorite color is, and she replies "Biege!" Later, when Mabel calls for ideas on how to get Stan to see a rainbow, Grenda says that she sometimes sees rainbows when she drinks expired milk, and proceeds to do so while Candy draws up a plan to reflect a rainbow from a waterfall. Upon finishing the milk, she speaks up in agreement to Candy's plan before collapsing to the floor and falling asleep.
PersonalityGrenda is insecure about her low, gruff voice, and is constantly belittled, as well as made to feel weird and out of place by popular girls such as Pacifica Northwest. This tends to make her uncomfortable, sad, and angry. She seems very supportive of her friends and while with them is usually happy.
Grenda is a light-skinned, large girl with auburn colored hair and a ponytail. Grenda wears a pink shirt that reads "COOL", and purple shorts as well as white socks and pink and purple sneakers. She also has a red mark on the right side of her cheek, and a yellow barrette on the hair on the right side of her head. In "Carpet Diem," she was shown in her sleepwear; a long pink nightdress with a purple bear head on it. Underneath the bear head, "BEAR" is written in purple, similar to her shirt.
- 107. "Double Dipper"
- 112. "Summerween"
- 116. "Carpet Diem"
- 117. "Boyz Crazy"
- 120. "Gideon Rises" (no lines)
"I used to sing like that. Before my voice changed."
"Oh no! They're aggressively dancing at us!"
"Sometimes, if I drink expired milk, I see rainbows! I'm gonna try right now!"
- In the ComicCon 2013 Gravity Falls panel Alex Hirsch stated that Candy Chiu and Grenda are Mabel's "life long friends."
- Her favorite color is beige.
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